Title: Department of State, Letter, Murray to Stoddart, April 15, 1971, Secret/LIMDIS, NARA.
Creator: Department of State
Date in Source: April 15, 1971
Subject: Great Britain - British government - Intelligence facilities - Acoustic intelligence - Sound Surveillance System - SOSUS - RAF Brawdy - Submarine surveillance - Hydrophones - Project BACKSCRATCH - Negotiations
Format: 4 p.
Note: Secret / Limited distribution